Evaporator for refrigeration machines



Sept. 3, 1929. R. E. SABIN EVAPORATOR FOR REFRIGERATION MACHINES Filed Nov. 18, 1.926

' Patented Sept. 3, 1929.

UNITED STATES PATENT OFFICE.

aarmonn a sum, or rnusnme, NEW Yoax.

nvarona'ron r03 nnrnrenna'rron iaacnmns.

' This invention relates to evaporators for use in connection with household refrigera tion machines, for the purpose of evaporating 1i( uefied refrigerant gas delivered from a con enser, having reference especially to The" invention also comprises novel fea-' tures of construction and combinations of parts which will be hereinafter described and claimed. i

.In the drawings- Figure 1 is a plan, partly in sedtion, of an Y eva orator embodying my invention. ig'. 2 is a frontelevation thereof.

Fig. 3 is a transverse vertical section, as on the line 3-3 of Fig. 1.

Fig. 4 is a longitudinal vertical section, en-- 1 larged, of one of the evaporatin chambers.

Referring to the drawings, A, designate spaced-a art duplicate units, each com IlS- ing a tan 10 ada ted to contain a Iiqui effective for heat a sorption, as, for exam le, a solution of calcium or brine. The ta .formed in a cast body of non-corrosive metal or alloy, which body is exteriorly flanged, as

at 11, and has a'rearward extension 12 supporting a vertical cylinder 13 constituting which are welded, braze an evaporating chamber for liquefied refrigerant gas. This cylinder is composed of a non-porous metal or alloy of hi her melting point than that of the tank, an the tank is cast about the, c linder, the two elements thus being, in e set, .an integral structure with the tank and evaporating chamberv in intimate thermal contact.

The c linder 13 is provided at its respective on s with flanged gias tight heads 14 cured in place.- The upper head is provided with an inlet 15 for liquefied refrigerant gas flowin from a suitable condenser, and the lower ead is provided with an outlet 16 for the vapor. The cylinder is fitted witha succession of spaced-apart cup-like bafiles 17 which are constructed and arranged to dibeen accidentally a or otherwise seing chamber of the unit A; a

Application filed November 18, 1926. Serial No. 149,262.

rest the fluid in a devious course during its descent through the evaporatin chamber. These bafiies consist of metal iaphragms having up-standing peripheral flanges 18 which are in intimate thermal contact with the interior wall of the'cylinder, so as to facilitate the flow of heat to the liquefiedgas and vapor in their devious passage. The baflies are perforated and providedwith short overflow tubes 19 which rise to a plane slightly below the top of the flanges or side walls of the respective battles, thus serving as overflow openings, or traps, which separate from thetliquid contained in the respective baflles any foreign matter that may have mitted to ,the gas system, thus preventing the entrainment of such matter with the va or, The overflow openings of the successive bafiles are arranged in staggered relation and are separated from each other as far as possible so as to ensure the distribution of the liquid and vapor throughout the chamber'and expose them to a succession o lar e metal evaporating areas during their evious passage from the to fer and promoting eflicient evaporatio The space above the topbaflle 17 is pref; erably of ample size to receive a fabric bag containing a quantity of suitable dehydratin material, if desired.

The two units, A, B, each. comprising an integral solution tank and an evaporating chamber, are supported in spaced relation by means of a suitable case, consisting,

preferably, of a U-shaped metal structure 20 which embraces the two units so as to enclose the two tanks of their cylinders. The forward upper and lower edges of the structure have formed thereon or sec red thereto longitudinal angle strips 20' WhlCh provide tongues or flanges to receive and support the crimped or folded longitudinal edges of a sheet-metal face plate 21. This ,plate has a' suitable opening therein to pentnit ready to the bottom of the evaporating cham er, thus facilitating heat transaccess to the chamber or compartment for'med between the two units.

In the present instance, the evaporating chambers are intercommunicably connected in series, that is, the supply pi 21from a condenser enters the inlet 15 of he evaporatipe 22 connects the outlet 16 of said chamber-with the inlet 15 of the evaporatin chamber of the unit B, and the outlet of t 0 letter chamber is connected with the usual receiver of the refrigeratlng system by means of a discharge pipe 23. The supply pipe 21 from 'the condenser is equipped with any usual or stance to be frozen is supported in the com partment, the lateralfianges 11 on the inner sides of the tank bodies presenting convenient.

ledges .for-the support of the receptacle, as indicated in dotted lines in Figs. 1 and 2.

I have herein shown andfdescribed an apparatus having two of my novel evaporating units connected in series, but; it is obvious I that they may be connected in parallel, series or series-parallel, and that in any case a greater number of units may be employed, where a plant of larger capacity is required.

It is to be understood that my invention is not limited to the particular construction and arrangement described, as the same may be modified within the principle of my invention and the scope of the appended claims.

I.claim 1. An evaporator unit for refrigeration machines, comprising a cast metal tank for heat absorbing liquid and a hollow structure about which the tank is cast, said structure being of higher melting metal thanthe tank, .and constituting an evaporating chamber having a non-"porous Wall in intimate thermal contact with the tank.

2. An evaporator forrefrigeration ma chines, comprising a pluralit of units, each embodying a tank for heat a sorbing liquid and an evaporating chamber, a casing enclosing said units and supporting them in 1 spaced relation so as to provide a compartclosing said units and supporting them in spaced relation so as to provide a compartment therebetween, said casing comprising a U-shaped structure embracing the units, and

a face plate having an opening therein at the front of the compartment, means intercommunicably connecting the plural chambers, and anexpansion valve in the-liquid supply connection to the chambers, said valve being located in the compartment.

I 4. An evaporator for refrigeration machines, comprising a pluralit of units, each embodying a tank for heat a sorbing liquid and an evaporating chamber, a-casing enclosing said units and supporting them in spaced relation so as to provide a compartment therebetween, means intercommunicably connecting the plural chambers in series, and an expansion valv e in'the liquid supply connection to the chambers.

' Signed at New York in the county and State of New York this 9th day of Novemher A. D. 1926.

. RAYMOND E.- SABIN. 

